The Quran that Uthman ended up producing was from the writings collected by Zaid bin Thabit who was the youngest of the collecters, rather than from some of the older collecters. The writings were not even compared, but Uthman just selected one of the collections and burned the rest.

Sahih Bukhari, 6.521: Narrated Masriq: `Abdullah bin `Amr mentioned `Abdullah bin Masud and said, "I shall ever love that man, for I heard the Prophet saying, 'Take (learn) the Qur'an from four: `Abdullah bin Masud, Salim, Mu`adh and Ubai bin Ka`b.' "
Sahih Bukhari, 6.522: Narrated Shaqiq bin Salama: Once `Abdullah bin Mas`ud delivered a sermon before us and said, "By Allah, I learnt over seventy Suras direct from Allah's Apostle . By Allah, the companions of the Prophet came to know that I am one of those who know Allah's Book best of all of them, yet I am not the best of them." Shaqiq added: I sat in his religious gathering and I did not hear anybody opposing him (in his speech).
Sahih Bukhari, 6.523: Narrated 'Alqama: While we were in the city of Hims (in Syria), Ibn Mas`ud recited Surat Yusuf. A man said to him), "It was not revealed in this way." Then Ibn Mas`ud said, "I recited it in this way before Allah's Apostle and he confirmed my recitation by saying, 'Well done!' " Ibn Mas`ud detected the smell of wine from the man's mouth, so he said to him, "Aren't you ashamed of telling a lie about Allah's Book and (along with this) you drink alcoholic liquors too?" Then he lashed him according to the law.
Sahih Bukhari, 6.524: Narrated `Abdullah (bin Mas`ud): By Allah other than Whom none has the right to be worshipped! There is no Sura revealed in Allah's Book but I know at what place it was revealed; and there is no Verse revealed in Allah's Book but I know about whom it was revealed. And if I know that there is somebody who knows Allah's Book better than I, and he is at a place that camels can reach, I would go to him.
Sahih Bukhari, 6.525: Narrated Qatada: I asked Anas bin Malik: "Who collected the Qur'an at the time of the Prophet ?" He replied, "Four, all of whom were from the Ansar: Ubai bin Ka`b, Mu`adh bin Jabal, Zaid bin Thabit and Abu Zaid."
Sahih Bukhari, 6.526: Narrated Anas bin Malik: When the Prophet died, none had collected the Qur'an but four persons;: Abu Ad−Darda'. Mu`adh bin Jabal, Zaid bin Thabit and Abu Zaid. We were the inheritor (of Abu Zaid) as he had no offspring.
Sahih Bukhari, 6.527: Narrated Ibn `Abbas: `Umar said, Ubai was the best of us in the recitation (of the Qur'an) yet we leave some of what he recites.' Ubai says, 'PI have taken it from the mouth of Allah's Apostle and will not leave for anything whatever." But Allah said "None of Our Revelations do We abrogate or cause to be forgotten but We substitute something better or similar."

Sahih Muslim, Bk 31, Number 6020: Abu Ahwas reported: We were in the house of Abu Musa along with some of the companions of 'Abdullah and they were looking at the Holy Book. 'Abdullah stood up, whereupon Abu Mas'ud said: I do not know whether Allah's Messenger, (may peace be upon him) has left after him one having a better knowledge (of Islam) than the man who is standing. Abu Musa said: If you say this, that is correct, because he had been present when we had been absent and he was permitted when we were detained.
Sahih Muslim, Bk 31, Number 6021: Zaid b. Wahab reported: I was sitting along with Hudhaifa and Abu Musa, and the rest of the hadith is the same. Sahih Muslim, Bk 31, Number 6022: 'Abdullah (b. Mas'ud) reported that he (said to his companions to conceal their copies of the Qur'an) and further said: He who conceals anything he shall have to bring that which he had concealed on the Day of judgment, and then said: After whose mode of recitation you command me to recite? I in fact recited before AIlah's Messenger (may peace be upon him) more than seventy chapters of the Qur'an and the Companions of Allah's Messenger (may peace be upon him) know it that I have better understanding of the Book of Allah (than they do), and if I were to know that someone had better understanding than I, I would have gone to him. Shaqiq said: I sat in the company of the Companions of Mubkmmad (may peace be upon him) but I did not hear anyone having rejected that (that is, his recitation) or finding fault with it.
Sahih Muslim, Bk 31, Number 6023: Abdullah reported: By Him besides Whom there is no god, there is no chapter in the Book of Allah about which I do not know as to where it was revealed and there is no verse about which I do not know in what context it was revealed, and if I were to know of one having a better understanding of the Book of Allah than I (and I could reach him) on the back of the mule, I would have definitely gone to him on camel's back. Sahih Muslim, Bk 31, Number 6024: Masruq reported: We used to go to Abdullah b. 'Amr and talk to him, Ibn Numair said: One day we made a mention of Abdullah b. Mas'ud, whereupon he said: You have made mention of a person whom I love more than anything else. I heard Allah's Messenger (may peace be upon him) as saying: Learn Qur'an from four persons: Ibn Umm 'Abd (i. e. 'Abdullah b. Mas'ud) he started from him−then Mu'adh b. Jabal and Ubayya b. Ka'b, then Salim the ally of Abu Hudhaifa.